Lactic Acid

Lactic acid is an alpha hydroxy acid (AHA) naturally derived from fermented sugars and milk sugars. It works on the skin by gently exfoliating the surface, helping remove dead skin cells and improve natural cell turnover. Compared to stronger AHAs, lactic acid has a larger molecular size, which makes it milder and better tolerated, especially for sensitive skin. It also has humectant properties, meaning it helps attract moisture and support skin hydration.
Source: National Center for Biotechnology Information (NCBI)

In skincare, lactic acid is widely used in cleansers, serums, and peels to smooth texture, improve dullness, and uneven skin tone. Regular, controlled use helps soften rough skin, fade mild pigmentation, and improve overall skin clarity without excessive irritation. Because it exfoliates while hydrating, lactic acid is often preferred by people who find stronger acids too harsh. Sunscreen is recommended when using lactic acid due to increased sun sensitivity.

FAQs

What is lactic acid?

Lactic acid is an alpha hydroxy acid used in skincare for gentle exfoliation. It removes dead skin cells from the surface of the skin. This helps improve texture and brightness. Lactic acid is milder than many other acids. It is suitable for regular skincare use.

What does lactic acid do for skin?

Lactic acid exfoliates the skin and supports faster cell turnover. It helps smooth rough texture and improve dullness. It also attracts moisture, which helps keep skin hydrated. With regular use, skin looks softer and more even. It is effective without being overly harsh.

Is lactic acid good for skin?

Yes, lactic acid is good for skin when used correctly. It improves skin texture, clarity, and hydration. It is especially suitable for dry or sensitive skin types. Proper use helps maintain a healthy skin barrier. Sunscreen use is important alongside it.

Is lactic acid safe during pregnancy?

Lactic acid is generally considered one of the milder exfoliating acids. Many people choose it during pregnancy due to its gentle nature. However, clinical guidance during pregnancy varies. It is best to consult a doctor before use.

Can I use glycolic acid and lactic acid together?

Using both together may increase the risk of irritation. Glycolic acid is stronger, while lactic acid is milder. Many routines alternate them on different days. This helps prevent over-exfoliation. Skin tolerance should always be monitored.

Can you use lactic acid and vitamin C together?

Yes, but it is better to use them at different times. Lactic acid exfoliates, while vitamin C provides antioxidant support. Using them separately helps reduce irritation. Many people use vitamin C in the morning and lactic acid at night.

Is lactic acid good for oily skin?

Yes, lactic acid can be used on oily skin. It helps remove dead skin cells that clog pores. Its hydrating properties prevent excessive dryness. This helps maintain balanced oil production. It works well in lightweight formulations.

What is lactic acid used for in skincare?

Lactic acid is used to exfoliate, smooth, and brighten the skin. It helps improve uneven texture and mild pigmentation. It also supports hydration and skin comfort. It is commonly found in cleansers and serums. Regular use improves overall skin appearance.